10" clutch kit comes with 9 1/4" disc.

I bough a new LOC ( although opened) 10" clutch kit and it contained a 9 1/4" disc.
Seller stated all he did was open the box. Nothing was removed or " switched".
Is this true ?
Why would LUK put in a 9 1/4" disc for a 10" pressure plate ?
I already ordered and received a 10" disc off evilbay.
Maybe it's just me, but l think a 10" pressure plate should have a 10" disc.

Your thoughts ?